These are Heavy-Duty Dansk Heat Exchangers. There is a less-expensive, economy version made by the same company on the market but the metal is real thin so they don't hold up the way the heavy-duty version does. So, ours might cost a little more but they'll hold up much longer.

These are Heavy-Duty Dansk Heat Exchangers. There is a less-expensive, economy version made by the same company on the market but the metal is real thin so they don't hold up the way the heavy-duty version does. So, ours might cost a little more but they'll hold up much longer.